DNS cache

What is DNS cache?

DNS cache, also known as a DNS resolver cache, is a temporary storage location for domain name system (DNS) records. When a user visits a website, their computer sends a request to a DNS server to translate the domain name into an IP address. The DNS server then looks up the IP address in its database and returns the result to the user's computer. This process can take time, especially if the website is located far away or if the DNS server is busy.

To speed up this process and reduce the load on DNS servers, DNS cache stores the results of previous lookups for a certain period of time. This means that if a user visits a website multiple times, their computer can quickly retrieve the IP address from the cache instead of sending a new request to the DNS server. This helps improve the performance and efficiency of the DNS system.

However, DNS cache can also cause issues if the stored information becomes outdated or incorrect. This can happen if a website changes its IP address or if there are network changes that affect the DNS records. In these cases, users may experience difficulties accessing certain websites until the cache is cleared or updated. Overall, DNS cache plays an important role in speeding up the DNS lookup process, but it is important to monitor and maintain it to ensure accurate and up-to-date information.